Holding structure



FIG. 1 is a top plan view of the holding structure, showing my newdesign;

FIG. 2 is a front elevational view thereof the back elevational viewbeing the mirror image thereof;

FIG. 3 is a bottom plan view;

FIG. 4 is a right side view; and,

FIG. 5 is a left side view.

The ornamental design for a holding structure, as shown.